Question

a water insoluble substance x 'on reacting with dilute H2SO4 release the colourless odourless gas accompanied by brisk effervescence when the gas was passed through water the solution obtained turned blue Litmus red
on bubbling in the gas through lime water it initially became milky and milkyness disappeared when the gas was passed in excess​

Answer 1

Answer:

Sodium carbonate (substance X)on heating with sulphuric acid we get sodium sulphate , CO2 and water

Na2CO3 +H2SO4 ---->Na2SO4 +CO2 +H2O

ON PASSING CO2 gas to lime water it turns milky white due to formation of CaCO3.

Ca(OH)2 +CO2 ---->CaCO3 +H2O

IF EXCESS OF CO2 IS PASSED, the milky white colour disappers due to formation of calciumhydrogen carbonate.

CaCO3+CO2+H2O---->Ca(HCO3)2

Answer 2

The water insoluble substance X is metal carbonate CaCO3.

CaCO3 (S) + H2SO4 (Aq) → CaSO4(Aq) + H2O (Aq) + O2 (G)

Ca(OH)2 + CO2 (G) →CaCO3 (S) + H2O (L)

(milky)

CaCO3 (S) + CO2 (G)+ H2O (Aq) →Ca(OH)2

(milkyness)